I see the error on certain pages of the forum. I am seeing it right now. It seems that it is just on posts and only on some of them. I don't see it on the homepage of the forum..when I do see the error it says that a site is not fully encrypted, it contains unencrypted elements (such as images) or that encryption is not strong enough..when I look at the details of the certificate on pages with error it says "Verified by: Not specified", but on the working ones it says "COMODO CA Limited" as it probably should. But when I open to view the certificate it look identical on both..(both says verified by "COMODO CA Limited"). Refreshing does not help. Im on Ubuntu by the way, using Firefox. Hope it helps. Tell me if you want me to run wireshark to look at it a bit more. Hope it helps
PS: I see "sid" parameter in the url sometimes which kinda worries me. I thought that it should be encrypted and urls can be seen by anyone in the middle.